[Bldg-sim] High hours outside throttling range

Joe Huang joe at drawbdl.com
Wed Mar 4 11:39:42 PST 2009


I don't know how it works in eQuest, but in DOE-2.1E, you can input any 
ASSIGNED-CFM to any conditioned zone.

Joe Huang
White Box Technologies


Lam, Linda wrote:
> To All,
>  
> I've got a high number of hours outside throttling range for a 
> 27-story building in India (40% of hours).  It is a VAV with electric 
> reheat.  Upon inputting 40,000 cfm per floor (25,000 sf), I get down 
> to about 3% of hours outside throttling range.  However, Trace only 
> calls for about 20,000 cfm per floor.  I double checked all my load 
> inputs across both programs and it seems like occupancy, lights and 
> equipment loads match up. 
>  
> I noticed that most of my unmet cooling load hours occur in my 
> internal zones.  So I input a system total supply volume of 25,000 cfm 
> per floor and also allocated 16,000 cfm to the internal zones. This 
> decreased the number of hours outside throttling range to about 4%.
>  
> My question is, am I allowed to "allocate" cfm to the internal zones 
> like that?
>  
> Thanks very much in advance!
> Linda
>  
>  
>  
> Linda Lam, LEED® AP WSP Flack + Kurtz 405 Howard Street, Suite 500 
> San Francisco, CA 94105 Direct: 415.402.5813 Main Tel: 415.398.3833 
> Fax: 415.433.5311 website: http://www.wspfk.com vCard: 
> http://vcards.wspfk.com/vcardloader.php?filename=flackkurtz-linda-lam-wspfk-com-1227040073.vcf 
> image:  
>  
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